Mercedes W639 Automatic Gearbox Oil Filler Pipe Line Hose A6392704300

The Mercedes W639 Automatic Transmission Oil Filler Hose is a specialized component of the automatic transmission system, designed for the front section of the vehicle. Thanks to its precise fit to the Mercedes construction and adherence to factory geometry, this used component ensures stable working fluid flow and safe operation of the automatic gearbox.

Specifications and technical data

• SKU: A6392704300
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6392704300
• Substitutable numbers: A6392704300, A 639 270 43 00
• Location on the vehicle: Front
• Gearbox type: Automatic
• Category: Other Transmission & Drivetrain

Purpose and Function in the Automatic Transmission System

The automatic transmission oil filler hose in the Mercedes W639 is responsible for the controlled flow of transmission oil during service and maintenance of the system. Located in the front of the vehicle, it works in conjunction with the automatic transmission's structure, allowing for convenient service access and reducing the risk of leaks when properly installed.

This component is particularly important for:

• automatic transmission oil change or top-up procedures,
• diagnostics and service of the transmission system,
• maintaining the correct level and quality of transmission oil.

Benefits of Using an Original Filler Hose

Using a dedicated oil filler hose in the Mercedes W639 allows for maintaining compliance with the original design specifications of the drivetrain. A properly routed line minimizes stress, reduces the risk of abrasion, and facilitates service operations in the front compartment.

Key advantages of this solution include:

• predictable system behavior during automatic transmission operation,
• easier access for mechanics during service,
• maintaining the correct oil flow path within the front section of the vehicle.

Component Condition and Practical Application in Service

The offered automatic transmission oil filler hose is a used part, making it an attractive solution for repairs where a reasonable cost is important while maintaining the original design. This type of component is particularly useful when the existing hose has suffered mechanical damage, external corrosion, or deformation that hinders proper transmission filling.

In workshop practice, this type of hose is used, among other things, for:

• replacing a damaged filler line after a collision or intervention in the front of the vehicle,
• comprehensive automatic transmission service,
• restoring the original routing of hoses in the front compartment.

Installation Tips and System Compatibility

When installing the oil filler hose in the Mercedes W639, pay attention to correct routing in the front area of the vehicle, following the factory mounting points. This ensures adequate clearance from moving parts and heat sources, and reduces the risk of operational damage.

Due to its integration with the automatic transmission, installation in a workshop environment is recommended, adhering to bleeding and transmission oil level check procedures upon completion of the work.

Related Categories and Technical Materials

If you are planning a comprehensive repair or upgrade of the drivetrain area in your Mercedes and need other parts from the same group, such as hoses, mounts, or additional service lines, check the available parts in the Other Mercedes category.

To better understand the specifics of transmission operation and the cost-effectiveness of using used parts in the drivetrain, it is worth reading the guide Used Automatic Transmission – When is it Worth It and What You Need to Know, which discusses, among other things, issues related to automatic transmissions and their servicing.

If you are also interested in the differences in the design and loads of drivetrain systems in high-performance cars, the article Audi RS vs. Other Models – What Lies Under the Hood and Chassis? may be helpful, discussing the impact of more powerful engines and drivetrains on the selection of service components.